Heat exchanger



INVEN OR ATTORNEYS n lill.

March 17, 1931-.

L HARTER HEAT EXGHANGER Original Filed Oct. 30, 1928 Patented Mar. 17, 1931 uNiTaD STATES PATENT loI-Flca ISAAC HAB/TER, F NEW YORK, N. Y., .ASSIGNOR TO THE BAIBCOCK EL WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY' HEAT EXCHANGER Application led Gctober rIhis invention relates to a device for transmitting heat from one fluid to another without causing the fluids to contact with each other or become mixed. The invention is 3 especially suitable for heating air by means of hot gases but is not restricted to this particular use.

The invention will be understood from the description in connection with the accomie panying drawings in which Fig. 1 is a vertical section through an illustrative embodi ment of the invention partlybroken away;

Fig. 2 is a section on an enlarged scale showing some of the details; Fig. 3 is a section i similar to Fig. 1 partly broken away showing a modification; and Fig. 4 is a view similar to Fig. 2 on an enlarged scale showing some of the details of Fig. 3.

In the drawings reference character 1 in- 26 dicates the casing of a heat exchanger or air heater that is vertically disposed. An air inlet 2 is provided on one side at the upper cud and an air outlet 3 on the other side at the lower end so that the air or other Huid to be heated passes in a general direction lon- `gitudinally along the outside of the tubes from the inlet to the outlet.

The heat exchanger is supported from above by means of I-beams l. The upper tube plate 5 is attached along its edges to the supports l by means of cross bars 6 that are welded or otherwise attached to the plate 5 and the supports 4, the welding being in dicated at 6.

The plate 5 is of appreciable thickness and is provided with rows of holes 7 parallel to each other at an angle of about to the surfaces of the plate 5. Rows of tubes 8 extend through the holes 7 in the plate 5 and are welded to the plate as indicated at 9 (Fig. 2). The tubes 8 are straight and lit the holes 7 tightly or are expanded into the holes which form tube seats therefor. The connection of the tubes 8 to the plate 5 in this manner aids in stitfening the plate 5 so that the tendency for the same to bow or sag down because of the tubeswill be decreased or entirely overcome. rlhe welding of the tubes to the plate results in appreciably stiliening and strengthening the tube plate. The

30, 1923, Serial No. 315,937. Renewed March 5, 1930.

lower ends othe tubes 8 pass loosely through the lower tube plate y10 that isI inclined and provided with holes simliar to the plate Theholes 11 in Vtube plate 10 are to be sufriciently large to permitthetubes 8 to slide therethrough due to expansion and contraction.

' An inlet for hot gases which pass through the tubes is indicated at 12 at'the lower end of the device and an outlet 13 for the cooled n gases is provided at the top.

In the modification shown in Fig. 3 the ends of the tubes 8 that pass through the holes 7 in the plate 5 arebeveled as shown at 14 so that they are flush with the upper surface of the tube plate instead of projecting above the same as indicated in Fig. 1. The upper ends of the tubes are welded to the tube plate asV shown at 15.

By this invention the tubes 8 are made straight so that the inside thereof can be readily cleaned by passing a. tube cleaner therethrough. They are installed parallel to each other and are supported from above and permitted to move freely through tho lower tube plate to provide for expansion and contraction. The tube plates are inclined so that the gas or air to be heated can enter and leave the device in such a manner that pockets or dead spaces are not left. The fluid to be heated may pass along the outside of the tubes and the heating liuid through the tubes or vice versa.

I claim:

1. In a heat exchanger, tube plates at opposite ends thereof at an angle of about 450 to the central axis of said exchanger and straight' tubes extending through both of said plates and attached to the upper one.

2. In a heat exchanger, tube plates at op posite ends thereof at an angle of about 45 to the central axis of said exchanger and straight tubes extending through both of said plates and welded-in holes in the upper one. Y

3. In a heat exchanger, tube plates at opposite ends thereof at an angle of about 45 to the central axis of said exchanger and straight parallel vertically disposed tubes loo extending through both of said plates and attached to the upper one.

4. In a heat exchanger, tube plates'at opposite ends thereof at an angle of about to the central axis of said ,exchanger and Astraight tubes extending tliroughboth of said plates and attached to the upper one, the upper ends of said tubes being beveled to be flush With the surface of its tube sheet.

5. In a heat exchanger, tube plates at opposite ends thereof at an angle of about 450 to the'central axis of said exchanger and straight tubes extending through both or said plates and attached to the upperA one and passing loosely through the otherV one.

6. In a heat exchanger, tube platesa't opposite. ends thereof at an angle vof about 45 to the central axis. of said exchanger, straight tubes extending through bothl of said plates and attached toithe upper one, an inlet for fluid on one side at one end ,of said exchanger andl an outlet in the other side at the other end. c l v 7. In a heat exchanger, tube plates aty opposite ends thereof at an angle of about 450 toy the centra-1 axis `of saicl exchange1, straight tubes extending through both of said .plates and attached tothe upper one, an inlet under the upper edge of vone plate and an outlet above the lower-edge of the other one. 8. In' aheat exchanger, tube plates at vopvposite ends thereof* at an angle of about 45 to thel central axis of said exchanger and straight tubes extending through both of said plates and attached to one onlyl ofthein.

ISAAC HARTER. 

